Then you will know that I am the Lord your God

Exodus 6:1-27
God will not make himself known to Abraham, Isaac and Jacob.
I am the Lord, and I will bring you out from under the yoke of the Egyptians. I will free you from being slaves to them, and I will redeem you with an outstretched arm and with mighty acts of judgment. 
I will take you as my own people, and I will be your God. Then you will know that I am the Lord your God, who brought you out from under the yoke of the Egyptians.
 "Then you will know that I am the Lord your God, who brought you out from under the yoke of the Egyptians."
God make confirmation again to Moses, his mighty hand, his promise, his Holy name.
Moses reported this to the Israelites, but they did not listen to him because of their discouragement and cruel bondage.
Who are Moses and Aron? The genealogy identifies them as the descendants of Jacob through the line of his son Levi. The list is an extract from the longer one in Numbers 26.
Why?
The name YHWH is used in Genesis from 2:4, but of course it was known to those who later wrote the stories down.
God gives freedom to his people, God redeems them from slaves with mighty acts of judgment.
One who turns the Lord and be chosen by the Lord will know that He is the Lord.
Much people under discouragement and cruel bondage won't listen to the word of God. For they did not know the mighty of the Lord and his love until his has no choice.
How?
Turn to the Lord more early, then take less pain and struggling in our life. After suffering we will know that the Lord is my God.